
Well then, as we have no idea of time when in a perfectly unconscious state, it is all the same to us when we are dead whether three months or ten thousand years pass away in the world of consciousness. For in the one case, as in the other, we must accept on faith and trust what we are told when we awake. Accordingly it will be all the same to you whether your individuality is restored to you after the lapse of three months or ten thousand years.
Schopenhauer is trying to show us that our true essence, our true inner being, exists in a state apart from time. It is simply unaware of time. It is only our conscious awareness that keeps track of time, and when we sleep, though we are still alive, we lose this ability. Have you ever been in the Flow state when you are immensely enjoying an activity and time seems to "fly"? Or have you ever stopped to think that no matter what time it is, it is always Now? So Schopenhauer applies this to death. He thinks we will still "be", we just won't be aware of time.